| Objective: To use VAS evaluation method to investigate the aesthetic evaluation and differences of the upper jaw dental midline discrepancies and common discrepancies of the upper and lower dental midlines when people smile,explore the influence factors of the differences,aiming to provide an objective aesthetic reference for the orthodontists in the prediction of clinical therapeutic effects,help them master the patients’ psychological aesthetic expectations,formulate therapeutic schedules which conform to smile aesthetics,and then achieve the therapeutic effects satisfied by both orthodontists and orthodontic patients.Methods: Two volunteers(one male and one female)were selected from the patients who completed their orthodontic treatment in 2019 in the orthodontics department of Yijishan Hospital affiliated to Wannan Medical College.Their complex smile pictures of natural head posture were taken,and then Adobe Photoshop CC 2019 image processing software was used to conduct the standardized processing of smile pictures of the two models.1/3of the face area was retained as the original production line maxillary teeth relative to the surface of the midline discrepancies template and the upper and lower teeth relative to the surface of the midline discrepancies template together,and then 1 mm was used as the variable,13 female and 13 male smile pictures which met the requirements were obtained after deviating 3 mm in left and right,respectively.The questionnaire was used for orthodontists(40),orthodontic patients(40)and the general population(100)to use VAS to evaluate the smile pictures whose order was disrupted.Then IBM SPSS Statistics 23 was used for statistical processing of the data,and the experimental results were statistically significant when P<0.05.Results: There was no significant difference in the left and right discrepancies of the dental midlines between male and female smile images among orthodontists,orthodontic patients,and the general population(P>0.05).In the scoring of female smile images,there was no statistical significance in the scoring of the original female image,the upper jaw dental midline discrepancies of 1mm,the upper and lower jaws dental midline discrepancies of 1mm and 2mm.In the scoring of male smile images,the three groups’ scoring difference in the ordinary image of male smile,the upper jaw dental midline discrepancies of 1mm,the upper and lower jaws dental midline discrepancies of 1mm and 2mm was not statistically significant.Then by comparing the scoring average of these images,it could be seen that the average score was generally lower than the rest of the two groups,namely,the orthodontist group’s aesthetics on the dental midline discrepancies were more stringent.In the scoring of female smile images,by comparing the dental midline discrepancies with the original image scoring,it could be found that the orthodontists showed statistical differences in the dental midline discrepancies of 1mm,2mm,and 3mm;the patients showed statistical differences in the dental midline discrepancies of 2mm and 3mm;the general population only showed statistical differences in the dental midline discrepancies of 3mm;When there were common dental midline discrepancies of the upper and lower jaws,the orthodontists had no a statistical difference in the score when the simultaneous discrepancies were 1mm,while the orthodontic patients and the general population only had statistical difference in the score when the simultaneous discrepancies were 3mm.The scoring results of male smile images were the same as that of female smile images,there was no statistical difference in the score of the patients for the upper jaw dental midline discrepancies of 2mm.When the discrepancies of female smile images were 2mm and 3mm,there was a statistical difference in the scores of the upper jaw dental midline discrepancies and the simultaneous dental midline discrepancies of the upper and lower jaws;when the discrepancies of male smile images were 3mm,there was a statistical difference in the scores of the upper jaw dental midline discrepancies and the simultaneous dental midline discrepancies of the upper and lower jaws.In the orthodontic patient group and the general population,there was a statistical difference in the scores of the upper jaw dental midline discrepancies and the simultaneous dental midline discrepancies of the upper and lower jaws only when the discrepancies of the male and female smile images were 3mm.In the orthodontist group,there were statistically significant differences in the scores of the upper jaw dental midline discrepancies and the simultaneous dental midline discrepancies of the upper and lower jaws when the discrepancies of the female smile images were 2mm and 3mm,while there were statistically significant differences in the scores of the upper jaw dental midline discrepancies and the simultaneous dental midline discrepancies of the upper and lower jaws when the discrepancies of the male smile images was 3mm.In the orthodontic patient group and the general population group,there were statistically significant differences in the scores of the upper jaw dental midline discrepancies and the simultaneous dental midline discrepancies of the upper and lower jaws only when the discrepancies of the female and male smile images were 3mm.It was found that the average score of the simultaneous dental midline discrepancies of the upper and lower jaws was higher than that of the upper jaw dental midline discrepancies among the three groups of people.In the general population,there were no statistically significant differences in the scores of various images of the dental midline discrepancies among male and female evaluators.Conclusion:1、 Orthodontists,orthodontic patients and the general population all believe that the left and right discrepancies of the dental midlines have no effect on the smile aesthetic evaluation.In the treatment of non-extraction cases,the vertical control of PASS is better than that of MBT,but there is no significant difference in treatment effect between before and after treatment..In the treatment of tooth extraction cases,PASS orthodontic technology can better control the position of molar 、 front teeth and mandibular plane.2、 Orthodontists,orthodontic patients and general population have significant differences in the smile aesthetics of the dental midline discrepancies.The sensitivity degree of the dental midline discrepancies from high to low is: Orthodontists,orthodontic patients,and general population.Orthodontists are most sensitive to the dental discrepancies,and it can be found that the maxillary midline discrepancies of 1mm or more and the maxillary midline discrepancies of 2mm or more are simultaneously skewed.The sensitivity of orthodontic patients is the second,and it can be found that the female smile of 2mm and above is like the maxillary midline discrepancies and the common discrepancies of the maxillary midline of 3mm and above.The general population is the last,and only the dental midline discrepancies of 3mm and above can be found.Orthodontists should provide correct aesthetic guidance for the discrepancies position of the dental midline in the clinical treatment process,and fully communicate with orthodontic patients when formulating treatment plans.3、 When the deviation was the same,orthodontists,orthodontic patients and the general population all believed that the common discrepancies of the upper and lower dental midlines were more beautiful than the single upper jaw dental midline discrepancies.Therefore,orthodontists should pay attention to the consistency of the upper and lower dental midlines in the clinical treatment.4、 Among the general population,the gender of the evaluators didn’t influence the smile aesthetic evaluation. |
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